Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ee8cb7e0b3b34857873b6dc468b102c91a6de2338edbfc5389804f5170f1a8' 
  AND token = 'TmU6IGCeo3CFL4FmIv8LDagbL9rUn+FmYqg8C/qrOR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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