Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf2fde0d8fd6c376b4d29361289a3afa4b56a6e8ffc814fef93ed7c71fa84b1' 
  AND token = 'W3BhmpOEtuX3WptKNHpI4qfIc6lPjMMiKnqufQYtM5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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