Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f975ef0cfbb26b9872897801f6bea644aac332e770ba2fbef4f8b12db868ae' 
  AND token = 'fSG/JZ7DFy1/fCO+QTMwi4vtoxMTqcmIArw4niy3r+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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