Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803a3530eba3c8eb96b3fa4201e6e09ce3dcce6bd6c751449d53cfcb92db3704' 
  AND token = 'l4cqV8/Se+xwhT29JHsCrPYTQ2UcwmiG65vCTReCRqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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