Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b6fcd5be7f37704f1d1f9d19050b5c4b4a0c9c6246d057eac48a35777b30e3' 
  AND token = '+qunvQm1q61jNZ7sVE2wnbCfYHsyq8VvrL1k1hwNlWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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