SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7b19da36447a1478f51132da7db62ae01b575525a0455df2790826d86c82b3ee' 
  AND token = 'ythIw7aGjPl7/k1aE2K5mzgg86yDuTjG8UUo/shDmhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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