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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '847e24d4d023f53e96f39b08d3a17267c46e3a46d000a69876eabad61e1aac86' 
  AND token = 'sIZeJ7z7rAHZpJLMARqzNria1Qizzu9c1OXZmLk5S9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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