Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20942a2a4a1626ac1d038d517efde193d6223c76031606e1ce9daf7fbf9bbf75' 
  AND token = '/tsEOjWR668gWkn5SqEYLJ6pzxiRFVzvt6lpsXezwMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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