Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c760d38438a039c4dc149ab85d56db01cd08fcdb520777cf45b3cf41282869' 
  AND token = '6IT6kMladV+/X1YoqKeIs15Rso+cB0LMkDYDbxjAoSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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