Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f582e3a75fd8c5a1b1d9bad0975bb866295eedec6fed6f749914958c404b7a0' 
  AND token = 'ZApaNFdyw6hCTjoZgWGIsC5fNyjHMQaruThrEOHLca4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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