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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e0672cdc6e696ab97bb1a79c79ddea5f4232b4601393620adba8f2e741f14283' 
  AND token = '7GNeZnCdxlTjLLNpBUEC7CvzkPbOVciWDLBplquXodo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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