Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c80cd75b21514942993f3a844afc9b0b65a115420b0399a423ca5e9178fa33' 
  AND token = 'oQ8M5uc39CldXuq+tZz6mQgtTUJkYlX2hfkRZQg6L4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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