Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3552f1cac4a652c58a17758acad49878831757deae1caeabc4ca768be3905bf' 
  AND token = 'fb6wNPtQNUPmb/ECldDQwskfwxIQvofEYDnWXtmiloA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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