Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6dd6a1e8c16dd38d4ac8ccc9df7c6817c3e66838dee53c13b678d985cf37f91' 
  AND token = 'hCw+vy/YVOJi6BEYXaChcCmoI/cr7xulxLUYZqj0VAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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