Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5338ad6656dd8a2817d919a353a78e8e1b5527b165b5bef347888cc189af746b' 
  AND token = 'b/59bAYhzlCH4lS4AlKnF7c1Q9h0IRKp94fS3WtRPgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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