Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a98e3418be52ae552e044aeb0e789b40796ae9076b7a54bc0ec5ed2e7402f45' 
  AND token = 'pwUaVqyLZBlV83Nsy7MJjDcUdCQ9xdsyrRYa+4oUJ10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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