Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4cc4e9a4e29f716be6809498c3bb9874fe1dda9dd7b52f39589fc67acca7b1' 
  AND token = 'ooB+3pEE4yfBKcdkLYHVcHOsklGF+s/DH92qCMJvcQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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