SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a3357c26d4c2f855bf6a0885abb4897defc0667bd916024b2075d12f6f17b58' 
  AND token = 'KY5dd/5e+coEC+H458D2J/CkmZ8aVbRxQRgoiBBHkNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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