Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed8c949eaea9961f5da12d32537a8f8f52dcc8a0141abc52c758315491b21ef' 
  AND token = 'gXHDHZh2QQ9gDNPVWwCgZgkIekMy6B5GMSFPDn2Dj84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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