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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4a3ae40cdc2242db818d1f796517ad5828229173f988fda3dc11c3f5179198af' 
  AND token = 'xNoKW/qqeLy2EZuMZhJ5nP385AcjGl99yz+eMAW6is8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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