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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '18e3db248d7d400bc3f19564a76ea8278cde9a08f4b48e5a0ef7cd48c40e3c9c' 
  AND token = 'kaG5Ux+M26E1p643WOMXzxaMiJCB7GmPW9UncSk5K7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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