Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e51e21348dd9e0578d8bcc86d7e270f23f0b94b76ad4d4b59dc12810b13c819' 
  AND token = 'a8Fm+L/ixFqC5+1AfJz818+QdFi0UVESC6ZTY0rt12c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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