SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7eae6c1450f3fb706b66837d0d2c5ecc49e757a6da33b328ee86862c8d1adf3f' 
  AND token = '5hpAWt+/Z+eEY/LlBsPlDm3PvUW3QWVmggbvOsouHi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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