Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18dbe37332815cba253cd08fe60de209b327af31c830f65787eaae17329d3cc7' 
  AND token = '1oePq5Z3+MxrGdKaoNKjflDdduDXnjTXFANCXvgfVSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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