Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3dd7fa79a96b607901800e58edc8af76c7283d44eee31c9df5aea9acd36d18a' 
  AND token = 'Iz+y2tdZGJo2RI2EWU9rfdMy3ASo2wBNs1Kq5OMn06I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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