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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '09c0ef758a60e8c289c67b7f6b046de33b8e40e9e3e2f0c25e3038ebc06a06e8' 
  AND token = 'zY6wZlooWk2Ayv7haZemCOIyXdYdp4k1nFOODLim06A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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