Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1fb19f1a7b59e3be6f1ae4168d1b37150a5ad5e7178ac1fe692e1028cc21ac' 
  AND token = 'OA4ciSFROCAQUpPC74/o3g97/MNJOzhPBQ6URHQSsvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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