SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '14eca15c3613f2042117640988e89785ea803c65aefdf3e7e3cb331983b25f9e' 
  AND token = 'K15pC8z1heVdgJ5hkm/Jtz+WT4OHLHwG8aRZY8/+hfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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