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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '40bd9d758005773ea8d66e167065210d4a792861e1eb00ec816af4940288d338' 
  AND token = 'xoD4jVY4tLZDVDagLFTore+6KjuWGl52riyApgG69CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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