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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '38174eb19e32de8794f61b6a178c0972013a9696437d86906b302c180bb482f4' 
  AND token = 'uOVFDlOxCBuQMP4hHfc8kV3ztA71sR8QL9tE2Hhf8cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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