Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4ec641937f9e9770ec13b987fb80f923a9283de2764e2fd93e2bccfcf18f0f' 
  AND token = 'ccxfy6QFRGB6Y/WZP22BQhMdtzteB3i7wFj2gpHuspA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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