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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b53e737f25ccf9f5a3b39467949047965818ce3a13f6b8860bbb5bda6de56c7b' 
  AND token = 'c0XA4g0wv7eAqTQqT6gKjDfxfnRdbpu1GRtThCa5j18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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