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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0bb18a5aa892a39d367419549d88be42838aa806a6e02ef7c6178644b85441af' 
  AND token = 'wTsTZM3lfRD4Ki/FMXyGG+ECe3DZTQVo99DdiDcZUNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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