Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784a0cdb6543313eebce14ecf45ae745d57990ce6be07378d5bd83d9d3401caa' 
  AND token = 'PttuZbYBWei8fvDmuiNJvIwMIwRgTcdUAhLicndC/wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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