Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffce438cde9501ecf16efad03c0309b7aa1a103025a2f4b9ac7c90f95c7f9dc' 
  AND token = 'aaxBQPPuDe03xUE5DQ35aTBUJZ5w7wZZPgBsYccK0os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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