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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3f1d83bb7d05541f8919105d9c981fe8a6bc58d89c71225a8e1b858aab78cb4d' 
  AND token = '3EEcB3pkSUBcFOdOj6zIq4P0YlryNIAAu3Hm5VYgDtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}