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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2bceb07eb979a68535d3636fa00bd01230bad161cdabe7bda4c0450721a21e52' 
  AND token = 's6X2/mBmFpjwRKF0Lqnp2XkyHr0Cz02fCuaM3kv5HzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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