Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75bf3332f3e09efb57c309eac40f97a236ee14e74fdac7ce5888cc609238813' 
  AND token = 'Hu+6zpl5Naj3RS1r4VjO7B3aEpZQKIN143Bg6tywkwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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