Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e274096b4a100a405aea6eddfb46058e5d3580f19e270afe1c64fc43a6d6d8a' 
  AND token = 'wxdyLzCfJ7wqRjU0ynhamOPK8fcDsf4RN36jYCPEgds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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