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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8bfa14be019f7fcfd017bc0b0fbf20f3b349fc1bca2ca853ab3a7bb70da853c8' 
  AND token = 'GovYT/BZ7qBqOKzz8dcUT5e4Bp2d96Mj6yxIDEXzyKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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