Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e30c2ec9c5aeb432b2cb02141eea0e1ed005a110a71943d19f5bf65c9fb214' 
  AND token = 'WYn/V4OKPNvxDoeN8rYZXybYF2AXOwu3ffb1DsOO5Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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