SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '02880a361c02599be40de4472569532f3fedf81865659175caae2fd76b2f21e4' 
  AND token = 'NUMCqx1++hrAlNkBJn/uKCvC2mqoaADckLs8YSorSCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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