Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c29c8cb14590796e0e197ad50b508cd9fcb37353c91583ce8da570a0bf5244' 
  AND token = '9DxdlNaXk6Ax8JGE8CLr1i3fHRe/yP88s9/P4Mlu3eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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