SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9825622defd00407ea24d3c2bc19a7dea6ad7a7670edbfc15af4714fa3e2b2bb' 
  AND token = 'HQ5CcrGUvlLY/wQUrNZwGcCay99AB61YgRUJoXCmRr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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