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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7c99b7a98cd6e0b32d4ec602506e5cca3de2183141c85c12dd6f517b3c5d248c' 
  AND token = 'y0aRIkN4KvEh1pa9SbgtISmLU5l+Wtn+mfS6hozx1gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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