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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bc42e83e4bc34b5a5cfcbcccbabf38404c0ad0be91a5780c26fb647bad7fe6af' 
  AND token = 'fdBHpi88nIuRAIoA8nvaJBFpNCM0PyVBBxzG044rqW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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