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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5219f4341f14e24f0c52b008ef6518a9f75fd6d6615b22c7c66e56003b8cd49d' 
  AND token = 'M9ue1NsbT6mL6am6EQioPEWWK0DdkalTA5mVpK1jTCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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