Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a08c14ae68ee8befb8267639c7232fe3ca76186adb36828aecce005b65bb431' 
  AND token = 'ksB7QZ9bfQ2LB6vTs5K2jHrZSMxddrTL5K6ARWtZzzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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