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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b7cae0da9665ac141cdee1eab76fc44d44aa529e31145629abd09df92d8e8257' 
  AND token = 'aWI2KcXJYwReuHf6s2ZIU9DivhdDxXcmOqUHbvk62i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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