SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ee2ffecb2d57130833867b3ff921719055cb6324db9e8200125dfe8a2e1acd7d' 
  AND token = 'SDjIcDFovOgZ+81HmM/TdDKF1akQHgpX1TXYAG6ob6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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