Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27423d5df752a268ba2d5a343f7644fd78f2c2a9f2cb1083abf6a0b2f0585d2a' 
  AND token = 'm1k5bNWPylDdPF+ieTAxpfyOI9NLpgMm8XxYTRfjsO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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