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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b0c113382e20dbe98ba8668bc424aefe27709212488d25851692a65d7756e141' 
  AND token = '4u7K87t/n8jH8N1a/mp3RV4oIoIRpqNl4KTzoFOXMX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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