Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6984102c771620db396534ed656e6635bb2543aed6dd67a65db0707ba17c6b' 
  AND token = '7BpR+rfG01m9k7ISTHu1etzEpTSkaj8zzfM5o4ET0GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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