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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '394d90361759b18a9bbf246c82e51c0f2f9f7e04e1027a183fc8819e99a4c352' 
  AND token = 'BA0ag0ku7t2snMhsikF4U5D1BTmMPpevgR52lNynq3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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