Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e35863ad94a6e2b8fa773854d8c6e2c4e646e2f7d927f9e7325496a0975e38' 
  AND token = 'sy6Iprj1n0Og7rSNqzy7jFMprAt7BN0AY4Pg8NuqNlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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