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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '03e5bb1791c187acd66c0c62a6c1b40f3d46eaea3c3dd61a6f614f5f9b8332be' 
  AND token = 'kSbJ0MLZ9qWfTxcdE2NxURfLCIa/XOOzcNQMLZKV2AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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