Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ca3f5f0cbe621a6d87e66ae85e7277db89eed9ab2a2edf24e06e207991def5' 
  AND token = '6j8Orx+YbG9JnwCMu3a7fMWCx9eKFTZyywGjq+6Oo/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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