Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66393e639f40a4ca95df5588399651c2e2837068fa8b1dab8c52afb0bacfd8be' 
  AND token = 'bjjUNnkfaRjSE9MJl0FzmDRkACG7dLG9o5HXasq1zAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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