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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '77cfb79ac9e7af66731ce35ca1504601dfe4eb4dbd5a6f5c435d3c8d10af873c' 
  AND token = '/Iy7KU4KMyPMvF6Q2UPH9LDwPosTOMsU6ij/jEEa1ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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