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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6fbcbeec5198d3989a4cc18275cd614566392e4886c750694e0522cf120ac514' 
  AND token = 'q4mykBjSWXhJlaJ6587WXZ97PSSNWmqXtdlCEfPK8kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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