SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '45d8baf5c03e84470f74a436cfd9d2fab22b0d31b5cc78a5d6c40dd416e195d9' 
  AND token = 'JOLmHkqE8k5cR5hbQr72QhgxIIB8xDE8PzY7m9oZfYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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