SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fcdb59ddda5ad4075c0fb84989549930a546315a70890b301ff08425cbc58d5a' 
  AND token = 'PrHwh5Aazp0gsXJW8INIyzDDIGpHOqz3a5BwPzkj7gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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