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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9def0e794ccaa25fccdb388a97090d67950963e5ee3710f78b7d595d9f211aa1' 
  AND token = 'KVr/zOatZ30OBMWRfkjoKGvh8LF5wo1iae1DKATLOq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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