SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '02fafa455334f4d9e62b3358daa20d7997d1eeb6ee39ba197a2718f53b5b4abf' 
  AND token = 'iy/sfwErO+rZjxr7GiUEUgi8XDbgACOHoXhLfzn3v4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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