SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a695017771f4dfabe9b89056dff11575f378ec9fda4ad4931c194ac2d0aa89b1' 
  AND token = 'J5ITI0NsK/0blY+Bs1vXSu/YWJDzTiGMzaM/ZxI2p78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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