Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce475f0c587cebf2cf0a095e9ca727b379d3549a45dee20ac4e8d97b7cb97a1b' 
  AND token = 'T8L5Y0ig2KmlFUNmUDFJ7XKEEoAY5ryYdhDp6rX2jTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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