Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c042a77fda85386f13f66c7b4286021d0f0b38e6411848e943bfbcc606480997' 
  AND token = 'UTIblnEC/jLVB7JwKlb3ejARkPVG0TXcTSa4nxqSKqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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