Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495a1485cc0de245ca8b6e1bb52d607a2306700de1e39dcff767f02e6e8b36d0' 
  AND token = 'uFMv09921DPOLhdQsaIEv5nO4LvSljBZHAVnLY/ysCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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