Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef830397a298f89085597a0d25a1e58c474ca7fa6d32dc3faf3e949f3b64e23d' 
  AND token = 'R7+gAUJoDAo+e/8Ec9JN6LbdE6wD8SP5PMs5Fb/qgM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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