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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3f6585828abf99de75a55c99b0c9b2931246a13c051994e07338987c28aaeffe' 
  AND token = '73gqSyw71VmSy6BFjHdqjofLHT7mh3ZoKpHWTtrP8D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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